GIC (Glass Ionomer Cement) is tooth coloured material, which is based on reaction between silicate glass powder and polyacrylic acid. GIC bond chemically to tooth structure and release fluoride for relatively long period.
Classification
Type I- For luting
Type II- For restoration
Type III- For liner & bases
Type IV- Fissure & sealant
Type V- As Orthodontic cement
Type VI- For core build up
Type VII- High fluoride releasing command set GIC
Type VIII- GIC for ART
Type IX- Geriatric and paediatric GIC
Composition
Powder
• Acid soluble calcium fluroalumino silicate glass
• Silica – 41.9%
• Alumina – 28.6%
• Aluminium Fluoride – 1.6%
• Calcium Fluoride – 15.7%
• Sodium Fluoride – 9.3%
• Aluminium Phosphate – 3.8%
• Fluoride portion act as ceramic flux. Strontium
• Barium or zinc oxide provide radio opacity.
Liquid
• Polyacrylic acid in the form co-polymer with itaconic acid & malice acid
• Tartaric acid: increase handling characteristic and increase working time
• Water: medium of reaction and hydrates the reaction products
Setting Time
Type I 4-5 minutes
Type II 7 minutes
Properties
Compressive strength- 150mpa
Tensile strength- 6.6mpa
Hardness- 49KHN
Solubility: Initial solubility is high due to leaching of intermediate products
Adhesion: It bonds chemically to the tooth structure
Aesthetic: GIC is tooth coloured material, but are inferior to composite. They lack translucency and rough texture.
Advantages
• Inherent adhesion to the tooth surface
• Good marginal seal
• Anticariogenic property
• Biocompatibility
• Minimal cavity preparation required
Disadvantages
• Low fracture resistance
• Low wear resistance
• Water sensitive during setting phase
• Less aesthetic compared to composite
Uses
• For luting
• For core build-up
• For eroded area
• For atraumatic restorative treatment
• As an orthodontic bracket adhesive
• As restoration for deciduous tooth
• Used in lamination
• Anterior aesthetic restoration material for class III and V restorations
World class dental clinic in Pune provides all types of dental restorations such as composite, GIC etc. Depending on the case, the doctors select on which restoration should be used. Visit us at bestorthodontistbracespune.in to know more.